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Summary of Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 15, 2012 | Aug. 31, 2014 USD ($) | Nov. 30, 2014 USD ($) | May. 31, 2015 USD ($) | May. 31, 2014 USD ($) | May. 31, 2013 USD ($) | Dec. 24, 2012 | May. 31, 2012 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Assets of disposal group, including intangibles, goodwill and fixed assets |  |  |  | $ 0 | $ 0 |  |  |
Liabilities of disposal group |  |  |  | 0 | 0 |  |  |
Stock split ratio for 100 percent of stock dividend declared | 2 |  |  |  |  |  |  |
Dividend payable as result of stock split (as a percent) |  |  |  |  |  |  | 100.00% |
Reserve balances for sales discounts, returns and miscellaneous claims |  |  |  | 724,000,000 | 610,000,000 |  |  |
Total advertising and promotion expenses |  |  |  | 3,213,000,000 | 3,031,000,000 | $ 2,745,000,000 |  |
Prepaid advertising and promotion expenses |  |  |  | 455,000,000 | 516,000,000 |  |  |
Allowance for uncollectible accounts receivable |  |  |  | 78,000,000 | 78,000,000 |  |  |
Net increase (decrease) in cash and equivalents |  | $ 83,000,000 | $ 53,000,000 | 1,632,000,000 | (1,117,000,000) | 1,083,000,000 |  |
Cash and equivalents (Note 6) |  | 2,303,000,000 | 2,273,000,000 | $ 3,852,000,000 | 2,220,000,000 | 3,337,000,000 |  | $ 2,254,000,000
Minimum | Building |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  |  |  | 2 years |  |  |  |
Minimum | Leasehold improvements |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  |  |  | 2 years |  |  |  |
Minimum | Machinery and Equipment |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  |  |  | 2 years |  |  |  |
Minimum | Software and Software Development Costs |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  |  |  | 2 years |  |  |  |
Maximum | Building |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  |  |  | 40 years |  |  |  |
Maximum | Leasehold improvements |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  |  |  | 40 years |  |  |  |
Maximum | Machinery and Equipment |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  |  |  | 15 years |  |  |  |
Maximum | Software and Software Development Costs |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  |  |  | 10 years |  |  |  |
Class B Common Stock |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Stock split ratio for 100 percent of stock dividend declared | 2 |  |  |  |  |  |  |
Class A Convertible Common Stock |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Stock split ratio for 100 percent of stock dividend declared | 2 |  |  |  |  |  |  |
Other Noncurrent Assets |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Allowance for uncollectible accounts receivable |  |  |  | $ 24,000,000 | 37,000,000 |  |  |
Prior Period Revisions to Foreign Currency Adjustments |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Net increase (decrease) in cash and equivalents |  |  |  | 0 | 0 |  |  |
Scenario, Adjustment | Prior Period Revisions to Foreign Currency Adjustments |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Net increase (decrease) in cash and equivalents |  | 0 | 0 |  | 0 | 0 |  |
Cash and equivalents (Note 6) |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  | $ 0

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